The Kegel exercise is tailored for your pelvic floor muscles, which are the muscles surrounding your urethra, bladder, rectum, and uterus. When done regularly, it could help to strengthen your pelvic floor muscles and train you to control these muscles effectively when giving birth. It's an easy exercise to do because you can do it anywhere and at any time!
To do the Kegel exercise, you should first identify your pelvic floor muscles by imitating the motion of stopping midway while urinating (don't actually do this while peeing) – the muscles you're using while doing this are your pelvic floor muscles. (Who knew, right?!)
Now that you have identified them, you should hold these muscles for three to 10 seconds per set, then relax them. You can do this while both sitting and standing. Aim to do this exercise for about four times a day, and you'll be getting more exercise than you think!